AD7294BCPZRL datasheet(3/48 Pages) AD

3 / 48 page

AD7294

Data Sheet

Rev. I | Page 2 of 47

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description......................................................................... 1

Revision History ............................................................................... 3

Functional Block Diagram .............................................................. 4

Specifications..................................................................................... 5

DAC Specifications....................................................................... 5

ADC Specifications ...................................................................... 6

General Specifications ................................................................. 8

Timing Characteristics ................................................................ 9

Absolute Maximum Ratings.......................................................... 10

Thermal Resistance .................................................................... 10

ESD Caution................................................................................ 10

Pin Configurations and Function Descriptions ......................... 11

Typical Performance Characteristics ........................................... 14

Terminology .................................................................................... 19

DAC Terminology...................................................................... 19

ADC Terminology...................................................................... 19

Theory of Operation ...................................................................... 20

ADC Overview ........................................................................... 20

ADC Transfer Functions ........................................................... 20

Analog Inputs.............................................................................. 20

Current Sensor............................................................................ 22

Analog Comparator Loop ......................................................... 23

Temperature Sensor ................................................................... 24

DAC Operation........................................................................... 25

ADC and DAC Reference.......................................................... 25

VDRIVE Feature.............................................................................. 26

Address Pointer Register ........................................................... 27

Command Register (0x00)........................................................ 28

Result Register (0x01)................................................................ 28

TSENSE1, TSENSE2 Result Registers (0x02 and 0x03)........ 29

TSENSEINT Result Register (0x04) ........................................ 29

DACA,DACB, DACC, DACD, Registers (0x01 to 0x04)............... 30

Alert Status Register A (0x05), Register B (0x06), and

Channel Sequence Register (0x08) .......................................... 30

Configuration Register (0x09).................................................. 31

Power-Down Register (0x0A)................................................... 32

DATAHIGH/DATALOW Registers: 0x0B, 0x0C (VIN0); 0x0E, 0x0F

(VIN1); 0x11, 0x12 (VIN2); 0x14, 0x15 (VIN3) .............................. 32

Hysteresis Registers: 0x0D (VIN0), 0x10 (VIN1), 0x13

(VIN2), 0x16 (VIN3) ................................................................. 32

TSENSE Offset Registers (0x26 and 0x27)................................... 33

I2C Interface .................................................................................... 34

General I2C Timing.................................................................... 34

Serial Bus Address Byte ............................................................. 35

Interface Protocol....................................................................... 35

Modes of Operation ....................................................................... 39

Command Mode ........................................................................ 39

Autocycle Mode.......................................................................... 40

Alerts and Limits Theory .............................................................. 41

Alert_Flag Bit.............................................................................. 41

Alert Status Registers ................................................................. 41

DataHIGH and DataLOW Monitoring Features............................ 41

Hysteresis..................................................................................... 42

Applications Information .............................................................. 43

Base Station Power Amplifier Monitor and Control............. 43

Gain Control of Power Amplifier............................................. 44

Layout and Configuration............................................................. 45

Power Supply Bypassing and Grounding................................ 45

Outline Dimensions....................................................................... 46

Ordering Guide .......................................................................... 46

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